. Author manuscript; available in PMC: 2009 Dec 2.

Published in final edited form as: Mol Psychiatry. 2007 Oct 16;13(9):897–908. doi: 10.1038/sj.mp.4002107

Table 1.

Characteristics of Research Subjects

Analysis:	CMRglc		Relative Radioactivity

	Control n = 7	MA n = 9	Control n = 12	MA N = 10
Age (years) ^a	33.1(7.17)	32.9 (7.17)	33.7 (7.49)	33.1 (6.79)
Gender (males/total number)	6/7	8/9	7/12	9/10
Subject’s Education (years) ^a	15.0 (2.08)	13.2 (2.10)	14.5 (2.07)	13.5 (2.17)
Mother’s Education (years) ^a,^b	13.4 (1.90)	13.2 (2.82)	12.9 (1.64)	13.5 (2.80)
Race
European (non-Hispanic)	5/7	4/9	8/12	5/10
European (Hispanic)	0/7	2/9	1/12	2/10
African American	2/7	1/9	3/12	1/10
Asian	0/7	2/9	0/12	2/10

Self – Reported Drug Use ^c
Methamphetamine Use
Duration (yr)	-	8.89 (4.2)	-	8.20 (4.5)
Average (g/wk)	-	2.10 (2.1)	-	2.01 (2.0)
Days Used in Last 30	-	19.3 (6.2)	-	18.1 (7.01)
Tobacco Smokers ^d	0/7	8/9^*	0/12	9/10^*
Marijuana Use
Days in Last 30	.29 (.76)	1.67 (3.32)	.17 (0.58)	1.70 (3.13)
Alcohol Use ^e
Days in last 30	1.86 (2.12)	1.44 (1.74)	2.00 (2.09)	1.3 (1.70)

Data shown are means (standard errors of the means) for the number of subjects indicated.

An index of socioeconomic status

Data shown are means (SEM) of self-reported drug use. In addition to the data tabled above regarding regular drug use, data were obtained on other illicit drugs. Seven of ten subjects in the MA group and two of twelve subjects in the control group reported lifetime use of an illicit drug other than marijuana. There were no occurrences of illicit drug use during the last 30 days.

Self-reported smoking ≥ 5 cigarettes per day.

Significantly different from control by Pearson Chi-Square analysis (χ² (1) = 18.28, p < .001 for relative activity analysis; (χ²(1) = 12.44, P<.001) for CMRglc measurement.

No subject in the MA group had a lifetime history of alcohol abuse or dependence. One control subject had a history of alcohol abuse but no current drug or alcohol-related diagnosis.